Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd34c6fc84d3d2a3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 01:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f1ce4ac46a320c7b00f4fb87688c354 SHA-1: ffddc72b3eee46da722d7afdbc36053783f4e48d SHA-256: cd34c6fc84d3d2a374937bb064d3b2ffebf15b6805691e4b8ba3992f3425a4c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised CMS upload directories, directing users to download further PDF files. The presence of a link farm on disposable hosting and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f68735a4---kemibomumizeduxa.pdf In PDF document text
    • http://pure-chiral.com/upload/files/wodasamatolemefalogiwi.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vifufunokebuxe.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/55997214392.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210905195230.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/35455668294.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_084657.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/wojeriwogufaxozivajewifa.pdfIn PDF document text
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f2518fa6f5543d61a0792be375729fec/kevegimowabopezak.pdfIn PDF document text
    • http://logicamail.it/draft/media/merofiwikimejebadataf.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/94488670553.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vepililotaj.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/volined.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/21644764000.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjl5qosbshpi2kcpf07ove12or/zetidakipufeda.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mr1ivrrsr517cd4g82ra0sob3s/99884253454.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/45709596742.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zidamujegijujule.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/lakefererakupekonolileror.pdfIn PDF document text
    • https://777mto.com/contents/files/44230679286.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090116305266530.pdfIn PDF document text
    • https://tempegaring.com/contents/files/zazozedij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+dark+flame+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 10396 bytes
SHA-256: d59533c418d612c325444b3a1a3c61924d973af1726c603739281b3d3cf1ee2e
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16936 bytes
SHA-256: 65d865ca05bb2334c35276f42a4485941f01030a3ffda11c3c8324a6d3e70526

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